CN109295382A - A kind of high nitrogen antifriction anticorrosion alloy and preparation method thereof - Google Patents
A kind of high nitrogen antifriction anticorrosion alloy and preparation method thereof Download PDFInfo
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- CN109295382A CN109295382A CN201811232302.6A CN201811232302A CN109295382A CN 109295382 A CN109295382 A CN 109295382A CN 201811232302 A CN201811232302 A CN 201811232302A CN 109295382 A CN109295382 A CN 109295382A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C37/06—Cast-iron alloys containing chromium
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Abstract
The present invention relates to a kind of high nitrogen antifriction anticorrosion alloys and preparation method thereof, belong to ferroalloy materials technical field.High nitrogen antifriction anticorrosion alloy of the invention is made of the element of following mass percent: C:2.1-2.5%, Cr:23-28%, Mo:0.5-0.8%, Si:0.9-1.2%, Mn:0.5-0.8%, N:0.2-0.6%, P≤0.01%, S≤0.01%, and surplus is iron and inevitable impurity.High nitrogen antifriction anticorrosion alloy of the invention, carbon, chromium, nitrogen element content are higher, and the performance with preferable anti-corrosion wear is suitable as the impeller material of Pulp pump.
Description
Technical field
The present invention relates to a kind of high nitrogen antifriction anticorrosion alloys and preparation method thereof, belong to ferroalloy materials technical field.
Background technique
The performance of mechanized equipment and the performance of its manufacture material are closely related.Pulp pump is widely used in mine, electric power, smelting
Industrial pump of the conveying of the industries such as gold, coal, environmental protection containing abrasive solids particle slurry, as technics of metallurgy mineral dressing station-service is defeated in slurry
It send, thermal power plant is for hydraulic(-ash) sluicing etc..
Due to containing corrosive medium in the slurry that conveys in most cases, along with the abrasion of solid particle, in slurry
In the rotor high-speed rotation of pump, corrodes and wear while acting on, keep the damaged surfaces of impeller extremely serious, substantially reduce
Workpiece service life.It follows that the damage of Pulp pump is corrosive wear the reason of even failure, corrosive wear typically refers to corruption
Lose the material leakage that friction surface occurs in environment.During corrosive wear, metal material (is cut on surface in receiving frictional force
Stress) while chemical or electrochemical reaction also occur with surrounding medium be lost so as to cause material.Corrosive wear
Corrosion behavior and abrasional behavior and individual corrosion or abrasion in journey have biggish difference, and corrosion can be ground with accelerated wear test
Damage can also promote to corrode, to accelerate the destruction of material.Therefore, corrosive wear has become material damage or equipment failure
One of the major reasons, in order to solve this problem, it is desirable to manufacture the material of Pulp pump tool while with preferable wearability
There is good corrosion resistance.
Currently, widely used slurry pump impeller material is mainly made of rich chromium cast iron.But Cr series white cast iron exists
Serious inter-phase corrosion, weight loss caused by inter-phase corrosion it is shared that ratio is higher in total weight loss weight.The drive of inter-phase corrosion
Power is the difference of the current potential between matrix phase and Carbide Phases, and during corrosion, carbide is that cathode is protected, and matrix is sun
Extremely accelerated corrosion.When inter-phase corrosion occurs, matrix is gradually eroded, therefore the supporting role meeting that matrix plays carbide
It is weakened, when the supporting role of matrix is gradually lost, carbide can be exposed, under the souring of slurry, carbonization
Object can be destroyed, fracture or monolith falls off, and the destruction of material be accelerated, so that the service life of workpiece declines to a great extent.
In the alloy, nitrogen is capable of forming and stable austenite, can be played the role of refining crystal grain and be improved hardness of cast,
Nitrogen can also absorb the hydrogen ion in corrosive liquid, improve the corrosion resisting property of steel.Therefore, nitrogen is to the wear and corrosion behavior for improving cast iron
Play preferable facilitation.
In metal smelt, inflated with nitrogen in smelting furnace, nitrogen-melt reacts on interface, diatomic nitrogen point
Son resolves into single nitrogen atom, and is absorbed in the melt.Either directly into liquid slag or melt addition metal nitride or its
Compound, this is the basic principle of melting nitrogen cast iron.
The method for preparing the more efficient of nitrogen cast iron has the methods of pressurization plasma-arc melting, hot isostatic pressing melting.Add
Pressure plasma-arc melting is melted, is refined and a kind of smelting process of seasoning metal using plasma arc as heat source.But
In molten temperature in pool there is fluctuation, so as to cause in molten bath nitrogen uniformization effect it is bad.In addition, the temperature in ion spray gun
Degree be unevenly distributed so that nitrogen there are different degrees of decomposition, finally also result in being unevenly distributed for nitrogen in molten bath, these are lacked
Point limits its popularization and application industrially.Using hot isostatic pressing melting, biggish pressure, the high nitrogen casting of preparation can reach in furnace
There is higher nitrogen content in iron, but easily form the precipitating of nitride in matrix, therefore is not suitable for the casting of large scale preparation high nitrogen
Iron is only limitted to the preparation in use for laboratory in material.
Therefore, the nitrogen content in nitrogen cast iron, significant to improve the wear and corrosion behavior of high nitrogen cast iron how is improved.
The Chinese invention patent application that application publication number is CN106086631A discloses a kind of high-hardness, wearable high nitrogen martensite not
Become rusty bearing steel, and chemical component is as follows by weight percentage: C:0.65-1.25%, Cr:13-20%, Mo:0.15-4.5%,
N:0.05-0.5%, V:0.03-1.2%, Si≤1%, Mn≤1%, Nb≤0.1%, surplus are iron and inevitable impurity.
Stainless steel nitrogen content with higher, but its wear-resisting and corrosion resistance is still to be improved.
Summary of the invention
The purpose of the present invention is to provide a kind of high nitrogen antifriction anticorrosion alloys, to improve the wear-resisting and resistance to of nitrogen cast iron alloy
Corrosive nature.The present invention also provides a kind of preparation methods of the high nitrogen antifriction anticorrosion alloy of simple process.
To achieve the above object, the technical scheme is that
A kind of high nitrogen antifriction anticorrosion alloy, is made of: C:2.1-2.5%, Cr:23- the element of following mass percent
28%, Mo:0.5-0.8%, Si:0.9-1.2%, Mn:0.5-0.8%, N:0.2-0.6%, P≤0.01%, S≤0.01%,
Surplus is iron and inevitable impurity.
High nitrogen antifriction anticorrosion alloy of the invention improves the content of nitrogen, and nitrogen is among the austenite stabilizing elements, can significantly expand
Big austenite phase field.It is smaller with the potential difference of carbide because the electrode potential of austenite is higher than other iron matrixes, thus
Single uniform austenitic matrix, which is more advantageous to, in cast iron improves its corrosion resisting property.Nitrogen can also refine the group of rich chromium cast iron
It knits, and improves alloy rigidity.In addition, nitrogen can be enriched on the interface of metal and oxidation film and the active surface of metal, subtract
Slow electrochemical corrosion is played the role of improving cast iron corrosion resisting property.
High nitrogen antifriction anticorrosion alloy of the invention is guaranteeing that nitrogen content is higher simultaneously, improves carbon content, improves conjunction
The formation of wear phase in gold, improves the wearability of alloy.
In addition, the present invention improves the chromium content in alloy, the corrosion resistance of rich chromium cast iron matrix depends primarily on matrix
Chrome content, chromium are easy passivation elements, and matrix surface easily forms passivating film in corrosive medium, and has self-repairing capability.Chromium
The raising of the content of element is conducive to the corrosion resisting property for improving alloy.
Preferably, above-mentioned high nitrogen antifriction anticorrosion alloy is made of the element of following mass percent: C:2.2-2.5%, Cr:
23-28%, Mo:0.5-0.8%, Si:0.9-1.2%, Mn:0.5-0.8%, N:0.2-0.6%, P≤0.01%, S≤
0.01%, surplus is iron and inevitable impurity.The content that carbon is defined in the program is 2.2-2.5%, can be further
Improve the content of carbide in high nitrogen antifriction anticorrosion alloy.
Preferably, above-mentioned high nitrogen antifriction anticorrosion alloy is made of the element of following mass percent: C:2.1-2.5%, Cr:
23-28%, Mo:0.5-0.8%, Si:0.9-1.2%, Mn:0.5-0.8%, N:0.2-0.6%, P≤0.01%, S≤
0.01%, rare earth element: 0.1-0.3%, surplus are iron and inevitable impurity.Rare earth element is the extremely strong cleanser of molten steel
With effective alterant of clean steel field trash.
High nitrogen antifriction anticorrosion alloy of the invention, carbon, chromium, nitrogen element content are higher, have preferable corrosion-resistant mill
The performance of damage is suitable as the impeller material of Pulp pump.
A kind of preparation method of high nitrogen antifriction anticorrosion alloy, includes the following steps:
1) Fe raw material, Mn raw material, Cr material vacuum melting are obtained into melting liquid, Si raw material, C raw material, chromium nitride is then added
Iron, molten alloyization processing；
2) melting liquid is heated, when melting liquid temperature is 1500-1550 DEG C, rare earth ferrosilicon alloy, casting is added
Molding to get.
Preparation method simple process, the process of high nitrogen antifriction anticorrosion alloy of the invention are easy to control.The present invention is using true
Sky induction positive pressure smelting method, vacuum induction positive pressure smelting are to be heated, melted under condition of negative pressure, refined, alloying and poured
The smelting process of note.There are self stirring actions of electromagnetic induction for melt when due to melting, accelerate the diffusion of nitrogen in the melt, from
And the time that nitrogen in melt reaches balance at a particular pressure is shortened, last gained ingot structure is also more uniform, in addition alloy
Recovery rate height, matallurgical products degree of purity with higher.
When moulding by casting, in order to avoid alloying component is oxidized, need to be protected using inert gas.Preferably, institute
It states moulding by casting to carry out in the presence of nitrogen, the air pressure of nitrogen is 1-2MPa.
When vacuum melting, it is also desirable to guarantee that alloying component avoids being oxidized, since temperature is higher, should guarantee height as much as possible
Spend vacuum.In general, vacuum degree when vacuum melting is 0.8-20Pa.
It is heat-treated after moulding by casting.The heat treatment includes quenching treatment, and the quenching treatment includes: to be warming up to
800 DEG C, 1h is kept the temperature, then heats to 1000-1050 DEG C, keeps the temperature 2-4h, it is cooling.The quenching condition can guarantee in refining alloy
Crystal structure.
Tempering is carried out after the quenching treatment, the tempering is 250 DEG C of heat preservation 2-4h.After tempering, close
Tissue in gold is martensite, retained austenite and carbonitride [M7(C,N)3].It is cooled down after 250 DEG C of heat preservation 2-4h.It is described
It is cooled to air-cooled.It is air-cooled to make alloy Temperature fall, conducive to uniform crystal structure is formed.
The rare earth ferrosilicon alloy consists of the following components in percentage by mass: Ce39-42%, Si≤37%, Mn≤
2.0%, surplus is iron and inevitable impurity.
Detailed description of the invention
Fig. 1 is the heat treatment state XRD of the high nitrogen antifriction anticorrosion alloy of the embodiment 1 of high nitrogen antifriction anticorrosion alloy of the invention
Figure；
Fig. 2 is the heat treatment state of the high nitrogen antifriction anticorrosion alloy in the embodiment 1 of high nitrogen antifriction anticorrosion alloy of the invention
SEM figure；
Fig. 3 be high nitrogen antifriction anticorrosion alloy of the invention embodiment 1-5 and the alloy material in comparative example it is corrosion-resistant
Performance comparison figure；
Fig. 4 is the embodiment 1-5 of high nitrogen antifriction anticorrosion alloy of the invention and the erosion resistance of the alloy material in comparative example
Polishing machine comparison diagram.
Specific embodiment
Technical solution of the present invention is described further combined with specific embodiments below.
High nitrogen antifriction anticorrosion alloy in following example is slurry pump impeller high nitrogen antifriction anticorrosion alloy.
In following example, high nitrogen antifriction anticorrosion alloy first adjusts element to contain in the preparation before rare earth ferrosilicon alloy is added
Amount.Adjusting constituent content is first sample detection, adjusts constituent content according to testing result and meets demand.High nitrogen antifriction anticorrosion alloy exists
The vacuum induction positive pressure smelting furnace used when preparation is mainly by furnace body, variable-frequency power sources, electric-control system, pumping equipment, vacuum
Valve, vacuum instrumentation, hydraulic system, pneumatic mechanism etc. composition, vacuum induction positive pressure smelting furnace body include working chamber, mould room,
The parts such as main feed compartment, alloy material room are able to carry out BOTTOM ARGON BLOWING, nitrogen, top blowing oxygen, nitrogen.Working chamber is used for alloy melting, closes
Gold material room is for storing alloy material, under vacuum system, realizes protection melting and alloying operation.Hydraulic system can be used for fascinating
Crucible fascinates, outflow iron liquid, charging, sampling, the driving of mould vehicle, furnace cover lifting etc..
The embodiment 1 of high nitrogen antifriction anticorrosion alloy
The high nitrogen antifriction anticorrosion alloy of the present embodiment, is made of the element of following mass percent: C:2.138%, Cr:
27.25%, Mo:0.6583%, Si:0.9036%, Mn:0.6336%, N:0.39%, P≤0.01%, S≤0.01%, rare earth
Element: Ce:0.1%, surplus are iron and inevitable impurity.
The embodiment 2 of high nitrogen antifriction anticorrosion alloy
The high nitrogen antifriction anticorrosion alloy of the present embodiment, is made of the element of following mass percent: C:2.237%, Cr:
25.62%, Mo:0.7025%, Si:1.037%, Mn:0.6418%, N:0.37%, P≤0.01%, S≤0.01%, rare earth
Elements C e:0.15%, surplus are iron and inevitable impurity.
The embodiment 3 of high nitrogen antifriction anticorrosion alloy
The high nitrogen antifriction anticorrosion alloy of the present embodiment, is made of the element of following mass percent: C:2.056%, Cr:
24.52%, Mo:0.5781%, Si:1.158%, Mn:0.5835%, N:0.29%, P≤0.01%, S≤0.01%, rare earth
Elements C e:0.20%, surplus are iron and inevitable impurity.
The embodiment 4 of high nitrogen antifriction anticorrosion alloy
The high nitrogen antifriction anticorrosion alloy of the present embodiment, is made of the element of following mass percent: C:2.377%, Cr:
26.35%, Mo:0.6813%, Si:1.081%, Mn:0.7034%, N:0.48%, P≤0.01%, S≤0.01%, rare earth
Elements C e:0.25%, surplus are iron and inevitable impurity.
The embodiment 5 of high nitrogen antifriction anticorrosion alloy
The high nitrogen antifriction anticorrosion alloy of the present embodiment, is made of the element of following mass percent: C:2.382%, Cr:
24.62%, Mo:0.7527%, Si:0.961%, Mn:0.6731%, N:0.52%, P≤0.01%, S≤0.01%, rare earth
Elements C e:0.30%, surplus are iron and inevitable impurity.
The embodiment 1 of the preparation method of high nitrogen antifriction anticorrosion alloy
The preparation method of the high nitrogen antifriction anticorrosion alloy of the present embodiment includes the following steps:
1) in the vacuum induction positive pressure smelting furnace of 20kg, first by proportioned Fe raw material, Mn raw material, Cr raw material (ferrochrome)
It is put into the working chamber Lu Nei crucible, then by proportioned Si raw material, C raw material, granular nitrided ferro-chromium (FeNCr10-B, Cr
>=60%, N:5.0%, C≤0.03%, Si≤2.5%) and rare earth ferrosilicon alloy main feed compartment and alloy material room is added, cover tightly
Vacuum (-tight) housing, starting vacuum pump make the vacuum degree for reaching 0.8Pa in vacuum (-tight) housing.
Starting induction heater carries out heating fusing and refining to the raw material in crucible, and temperature is controlled at 1500 DEG C, obtained
Melting liquid.
2) Si raw material, C raw material, granular nitrided ferro-chromium are sequentially added into melting liquid, molten alloyization processing utilizes
Medium-high frequency induction heating, keeping melting liquid temperature is 1500 DEG C, inspection by sampling, if each element content does not meet component requirements,
The content of respective element is adjusted to comply with requirement.
3) rare earth ferrosilicon alloy is added in casting ladle, the melting liquid in crucible is then poured into casting ladle using hydraulic system
In, make melting liquid coagulation forming, obtains ingot casting.During coagulation forming, controlling the nitrogen pressure in furnace (in working chamber) is
1.3MPa.Rare earth ferrosilicon alloy by forming following weight percentage components: Ce39%, Si30%, Mn1.3%, and surplus is iron
With inevitable impurity.
4) ingot casting that step 3) obtains first is quenched, quenching treatment is specifically: is first warming up to 800 DEG C of heat preservations
1h, then heats to 1000 DEG C of heat preservation 2h, and air-blast quenching is simultaneously cooled to room temperature.Tempering is carried out after quenching treatment, at tempering
Reason be specifically in 250 DEG C of heat preservation 2h, be then air-cooled to room temperature to get.
The embodiment 2 of the preparation method of high nitrogen antifriction anticorrosion alloy
The preparation method of the high nitrogen antifriction anticorrosion alloy of the present embodiment includes the following steps:
1) in the vacuum induction positive pressure smelting furnace of 20kg, proportioned Fe raw material, Mn raw material, Cr raw material are first put into furnace
In interior working chamber's crucible, then proportioned Si raw material, C raw material, granular nitrided ferro-chromium and rare earth ferrosilicon alloy are added
Main feed compartment and alloy material room, cover tightly vacuum (-tight) housing, and starting vacuum pump makes the vacuum degree for reaching 2Pa in vacuum (-tight) housing.Then starting sense
Heating furnace is answered to carry out heating fusing and refining to the raw material in crucible, temperature is controlled at 1500 DEG C, obtains melting liquid.
2) Si raw material, C raw material, granular nitrided ferro-chromium are sequentially added into melting liquid, molten alloyization processing utilizes
Medium-high frequency induction heating, when melting liquid temperature is 1520 DEG C, inspection by sampling, if each element content does not meet component requirements,
The content of respective element is adjusted to comply with requirement.
3) rare earth ferrosilicon alloy is added in casting ladle, the melting liquid in crucible is then poured into casting ladle using hydraulic system
In, make melting liquid coagulation forming, obtains ingot casting.During coagulation forming, controlling the nitrogen pressure in furnace (in working chamber) is
1.3MPa.Rare earth ferrosilicon alloy by forming following weight percentage components: Ce39%, Si30%, Mn1.3%, and surplus is iron
With inevitable impurity.
4) ingot casting that step 3) obtains first is quenched, quenching treatment is specifically: is first warming up to 800 DEG C of heat preservations
1h, then heats to 1000 DEG C of heat preservation 3h, and air-blast quenching is simultaneously cooled to room temperature.Tempering is carried out after quenching treatment, at tempering
Reason be specifically in 250 DEG C of heat preservation 2h, be then air-cooled to room temperature to get.
The embodiment 3 of the preparation method of high nitrogen antifriction anticorrosion alloy
The preparation method of the high nitrogen antifriction anticorrosion alloy of the present embodiment includes the following steps:
1) in the vacuum induction positive pressure smelting furnace of 20kg, proportioned Fe raw material, Mn raw material, Cr raw material are first put into furnace
In interior working chamber's crucible, then proportioned Si raw material, C raw material, granular nitrided ferro-chromium and rare earth ferrosilicon alloy are added
Main feed compartment and alloy material room, cover tightly vacuum (-tight) housing, and starting vacuum pump makes the vacuum degree for reaching 10Pa in vacuum (-tight) housing.Then starting sense
Heating furnace is answered to carry out heating fusing and refining to the raw material in crucible, temperature is controlled at 1500 DEG C, obtains melting liquid.
2) Si raw material, C raw material, granular nitrided ferro-chromium are sequentially added into melting liquid, molten alloyization processing utilizes
Medium-high frequency induction heating, when melting liquid temperature is 1550 DEG C, inspection by sampling, if each element content does not meet component requirements,
The content of respective element is adjusted to comply with requirement.
3) rare earth alterative is added in casting ladle, the melting liquid in crucible is then poured into casting ladle using hydraulic system
In, make melting liquid coagulation forming, obtains ingot casting.During coagulation forming, controlling the nitrogen pressure in furnace (in working chamber) is
1.0MPa.Rare earth ferrosilicon alloy by forming following weight percentage components: Ce39%, Si30%, Mn1.3%, and surplus is iron
With inevitable impurity.
4) ingot casting that step 3) obtains first is quenched, quenching treatment is specifically: is first warming up to 800 DEG C of heat preservations
1h, then heats to 1000 DEG C of heat preservation 4h, and air-blast quenching is simultaneously cooled to room temperature.Tempering is carried out after quenching treatment, at tempering
Reason be specifically in 250 DEG C of heat preservation 3h, be then air-cooled to room temperature to get.
The embodiment 4 of the preparation method of high nitrogen antifriction anticorrosion alloy
The preparation method of the high nitrogen antifriction anticorrosion alloy of the present embodiment includes the following steps:
1) in the vacuum induction positive pressure smelting furnace of 20kg, proportioned Fe raw material, Mn raw material, Cr raw material are first put into furnace
In interior working chamber's crucible, then proportioned Si raw material, C raw material, granular nitrided ferro-chromium and rare earth ferrosilicon alloy are added
Main feed compartment and alloy material room, cover tightly vacuum (-tight) housing, and starting vacuum pump makes the vacuum degree for reaching 15Pa in vacuum (-tight) housing.Then starting sense
Heating furnace is answered to carry out heating fusing and refining to the raw material in crucible, temperature is controlled at 1500 DEG C, obtains melting liquid.
2) Si raw material, C raw material, granular nitrided ferro-chromium are sequentially added into melting liquid, molten alloyization processing utilizes
Medium-high frequency induction heating, when melting liquid temperature is 1550 DEG C, inspection by sampling, if each element content does not meet component requirements,
The content of respective element is adjusted to comply with requirement.
3) rare earth alterative is added in casting ladle, the melting liquid in crucible is then poured into casting ladle using hydraulic system
In, make melting liquid coagulation forming, obtains ingot casting.During coagulation forming, controlling the nitrogen pressure in furnace (in working chamber) is
1.6MPa.Rare earth ferrosilicon alloy by forming following weight percentage components: Ce39%, Si30%, Mn1.3%, and surplus is iron
With inevitable impurity.
4) ingot casting that step 3) obtains first is quenched, quenching treatment is specifically: is first warming up to 800 DEG C of heat preservations
1h, then heats to 1050 DEG C of heat preservation 2h, and air-blast quenching is simultaneously cooled to room temperature.Tempering is carried out after quenching treatment, at tempering
Reason be specifically in 250 DEG C of heat preservation 2h, be then air-cooled to room temperature to get.
The embodiment 5 of the preparation method of high nitrogen antifriction anticorrosion alloy
The preparation method of the high nitrogen antifriction anticorrosion alloy of the present embodiment includes the following steps:
1) in the vacuum induction positive pressure smelting furnace of 20kg, proportioned Fe raw material, Mn raw material, Cr raw material are first put into furnace
In interior working chamber's crucible, then proportioned Si raw material, C raw material, granular nitrided ferro-chromium and rare earth ferrosilicon alloy are added
Main feed compartment and alloy material room, cover tightly vacuum (-tight) housing, and starting vacuum pump makes the vacuum degree for reaching 20Pa in vacuum (-tight) housing.Then starting sense
Heating furnace is answered to carry out heating fusing and refining to the raw material in crucible, temperature is controlled at 1500 DEG C, obtains melting liquid.
2) Si raw material, C raw material, granular nitrided ferro-chromium are sequentially added into melting liquid, molten alloyization processing utilizes
Medium-high frequency induction heating, when melting liquid temperature is 1550 DEG C, inspection by sampling, if each element content does not meet component requirements,
The content of respective element is adjusted to comply with requirement.
3) rare earth alterative is added in casting ladle, the melting liquid in crucible is then poured into casting ladle using hydraulic system
In, make melting liquid coagulation forming, obtains ingot casting.During coagulation forming, controlling the nitrogen pressure in furnace (in working chamber) is
1.9MPa.Rare earth ferrosilicon alloy by forming following weight percentage components: Ce39%, Si30%, Mn1.3%, and surplus is iron
With inevitable impurity.
4) ingot casting that step 3) obtains first is quenched, quenching treatment is specifically: is first warming up to 800 DEG C of heat preservations
1h, then heats to 1050 DEG C of heat preservation 3h, and air-blast quenching is simultaneously cooled to room temperature.Tempering is carried out after quenching treatment, at tempering
Reason be specifically in 250 DEG C of heat preservation 4h, be then air-cooled to room temperature to get.
Comparative example
This comparative example with common rich chromium cast iron be comparison, the common rich chromium cast iron by following mass percent element group
At: C:3.2%, Cr:23.7%, Mo:0.45%, Mn:1.23%, Si:0.52%, Ni:0.42%, Cu:0.18%, P≤
0.01%, S≤0.01%, surplus are iron and inevitable impurity.
Test example
(1) physical and chemical testing
High nitrogen antifriction anticorrosion alloy in the embodiment 1 of high nitrogen antifriction anticorrosion alloy is heat-treated (quenching+tempering).
It takes representative region to be polished, polished with sand paper the material after heat treatment, Phase Structure Analysis is carried out on X-ray diffractometer.
It takes representative region to be polished with sand paper the material after heat treatment, is polished, corroded later, seen using scanning electron microscope
It examines.
Test result difference is as depicted in figs. 1 and 2.
By Fig. 1 and Fig. 2 it is found that by XRD analysis, the phase composition after heat treatment is martensite+retained austenite+carbon nitridation
Object M7(C,N)3.High nitrogen antifriction anticorrosion alloy tissue topography is as shown in Fig. 2, the eutectic carbide of high nitrogen antifriction anticorrosion alloy is in net
Shape distribution, in eutectic structure the form of carbide there are two types of the i.e. irregular prismatic carbide of type and short strip shape carbide, that
This is isolated by matrix, and a large amount of granular proeutectoid carbides are present in matrix.
(2) measuring mechanical property
Take in the embodiment 1-5 and comparative example of high nitrogen antifriction anticorrosion alloy alloy material (high nitrogen antifriction anticorrosion alloy or
Common rich chromium cast iron), its hardness and impact flexibility are tested using test method in the prior art.
Test result is as shown in table 1.
Measurement of Material Mechanical Performance comparison in 1 embodiment 1-5 of table and comparative example
| Hardness (HRC) | Impact flexibility (J/cm2) | |
| Embodiment 1 | 58.09 | 10.375 |
| Embodiment 2 | 59.37 | 9.261 |
| Embodiment 3 | 56.79 | 10.948 |
| Embodiment 4 | 59.89 | 9.035 |
| Embodiment 5 | 60.31 | 8.962 |
| Comparative example | 56.54 | 5.25 |
As can be seen from Table 1, the hardness and impact flexibility of high nitrogen antifriction anticorrosion alloy of the invention are above in comparative example
Common rich chromium cast iron, show that the comprehensive mechanical property of high nitrogen antifriction anticorrosion alloy of the invention is preferable.
(3) corrosion resistance is tested
Take in the embodiment 1-5 and comparative example of high nitrogen antifriction anticorrosion alloy alloy material (high nitrogen antifriction anticorrosion alloy or
Common rich chromium cast iron), it is tested in the H of different quality containing using test method in the prior art2SO4Corrosion in solution
Weight loss.
Test results are shown in figure 3.
As seen from Figure 3, the corrosion resistance highest of high nitrogen antifriction anticorrosion alloy of the invention can be common rich chromium cast iron
1.47 times, the corrosion resistance of high nitrogen antifriction anticorrosion alloy is obviously got well than common rich chromium cast iron.
(4) erosion-wear-resisting performance
Take the high nitrogen antifriction anticorrosion alloy in the embodiment 1-5 and comparative example of high nitrogen antifriction anticorrosion alloy or common high chromium casting
Iron tests its erosion-wear-resisting performance, and the condition of erosion resistance tests is as follows:
Slurry composition are as follows: the quartz sand of 40% (mass fraction), surplus are distilled water；Room temperature；The erosion time is 240min；
Erosion angle is 60 °；Erosion speed is 23m/s.
Test results are shown in figure 4.
As seen from Figure 4, under identical experiment condition, the erosive wear of high nitrogen antifriction anticorrosion alloy of the invention is lost
Rate is lower than common rich chromium cast iron again, and the erosion-wear-resisting performance of high nitrogen antifriction anticorrosion alloy can be the 1.26- of common rich chromium cast iron
1.31 times, show that the erosion-wear-resisting of high nitrogen antifriction anticorrosion alloy of the present invention is had excellent performance.
Claims (10)
1. a kind of high nitrogen antifriction anticorrosion alloy, which is characterized in that be made of the element of following mass percent: C:2.1-2.5%,
Cr:23-28%, Mo:0.5-0.8%, Si:0.9-1.2%, Mn:0.5-0.8%, N:0.2-0.6%, P≤0.01%, S≤
0.01%, surplus is iron and inevitable impurity.
2. high nitrogen antifriction anticorrosion alloy according to claim 1, which is characterized in that by the element group of following mass percent
At: C:2.2-2.5%, Cr:23-28%, Mo:0.5-0.8%, Si:0.9-1.2%, Mn:0.5-0.8%, N:0.2-0.6%,
P≤0.01%, S≤0.01%, surplus are iron and inevitable impurity.
3. high nitrogen antifriction anticorrosion alloy according to claim 1, which is characterized in that by the element group of following mass percent
At: C:2.1-2.5%, Cr:23-28%, Mo:0.5-0.8%, Si:0.9-1.2%, Mn:0.5-0.8%, N:0.2-0.6%,
P≤0.01%, S≤0.01%, rare earth element: 0.1-0.3%, surplus are iron and inevitable impurity.
4. a kind of preparation method of high nitrogen antifriction anticorrosion alloy, which comprises the steps of:
1) Fe raw material, Mn raw material, Cr material vacuum melting are obtained into melting liquid, Si raw material, C raw material, nitrided ferro-chromium is then added, melted
Melt Alloying Treatment；
2) melting liquid is heated, when melting liquid temperature is 1500-1550 DEG C, addition rare earth ferrosilicon alloy, moulding by casting,
To obtain the final product.
5. the preparation method of high nitrogen antifriction anticorrosion alloy according to claim 4, which is characterized in that the moulding by casting exists
It is carried out in the presence of nitrogen, the air pressure of nitrogen is 1-2MPa.
6. the preparation method of high nitrogen antifriction anticorrosion alloy according to claim 4, which is characterized in that vacuum is molten in step 1)
Vacuum degree when refining is 0.8-20Pa.
7. the preparation method of high nitrogen antifriction anticorrosion alloy according to claim 4, which is characterized in that carried out after moulding by casting
Heat treatment, the heat treatment include quenching treatment, and the quenching treatment includes: to be warming up to 800 DEG C, keep the temperature 1h, then heat to
1000-1050 DEG C, 2-4h is kept the temperature, it is cooling.
8. the preparation method of high nitrogen antifriction anticorrosion alloy according to claim 7, which is characterized in that after the quenching treatment
Tempering is carried out, the tempering is 250 DEG C of heat preservation 2-4h.
9. the preparation method of high nitrogen antifriction anticorrosion alloy according to claim 8, which is characterized in that after the tempering
Cooled down, it is described be cooled to it is air-cooled.
10. according to the preparation method of high nitrogen antifriction anticorrosion alloy described in claim 4-8 any one, which is characterized in that institute
State rare earth ferrosilicon alloy to consist of the following components in percentage by mass: Ce 39-42%, Si≤37%, Mn≤2.0%, surplus are
Iron and inevitable impurity.
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| CN113265580A (en) * | 2021-05-28 | 2021-08-17 | 河南科技大学 | High-nitrogen high-vanadium high-chromium wear-resistant alloy and preparation method thereof |
| CN114540718A (en) * | 2020-11-26 | 2022-05-27 | 现代自动车株式会社 | Self-healing alloy and preparation method thereof |
| CN115679189A (en) * | 2022-09-08 | 2023-02-03 | 徐州工程学院 | Wear-resistant material for dynamic cone, dynamic cone and preparation method of dynamic cone |
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